In other words, 454.960 pennyweights is 0.00136 times the weight of a Grizzly Bear, and the weight of a Grizzly Bear is 735 times that amount.

(a.k.a. brown bear, a.k.a. silver bear, Ursus arctos horribilis) (Adult, male, coastal area population average)An adult, male grizzly bear from a coastal area (where food is plentiful) can weigh up to 335,000 pennyweights. In spite of their tremendous size, grizzly bears can run at speeds of up to 55 kph (34 mph).

In other words, the weight of a Nail is 0.0011 times 454.960 pennyweights.

(for 15-gauge, 2-inch, finishing nails)
A two-inch finishing nail weighs 0.510 pennyweights. Nails have been in use for more than 5,400 years and were ven used as a medium of exchange in ancient times.

In other words, 454.960 pennyweights is 0.00034 times the weight of a Rhinoceros, and the weight of a Rhinoceros is 2,900 times that amount.

(for Black rhinoceros, Diceros bicornis) (Adult, male)An adult black rhinoceros weighs between 1,400,000 pennyweights. Rhinoceros are extremely aggressive — nearly one of every two males will die as a result of fighting with other rhinoceros.

It's about one-four-thousandth as heavy as The Tongue of a Blue Whale.

In other words, 454.960 pennyweights is 0.00026 times the weight of The Tongue of a Blue Whale, and the weight of The Tongue of a Blue Whale is 3,800 times that amount.

(Balaenoptera musculus) (adult)The tongue of a Blue Whale can weigh up to 1,700,000 pennyweights. Despite their tremendous size, blue whales feed almost exclusively on tiny crustaceans called krill and cannot swallow anything much larger than a beach ball.